下列结论中,正确的是
A.若实数A是a与b的等差中项,则必有; |
B.若实数a,G,b满足,则G必是a与b的等比中项; |
C.若数列是常数数列 a,a,a,·····,则既是等差数列,又是等比数列; |
D.若等差数列的前项和(a,b,c为实常数),则必有:c=0. |
推荐套卷
下列结论中,正确的是
A.若实数A是a与b的等差中项,则必有; |
B.若实数a,G,b满足,则G必是a与b的等比中项; |
C.若数列是常数数列 a,a,a,·····,则既是等差数列,又是等比数列; |
D.若等差数列的前项和(a,b,c为实常数),则必有:c=0. |